Mechanical movement



(No Model.)

W. E. BROOK. MEGHANIGAL MOVEMENT.

Patented May 6, 1890.

WIT/V8859:

M M56L$d INVENTOR ATTORNEY.

UNITED STATES PATENT OFFICE.

WVILLIAM E. BROOK, OF PLAINFIELD, NEW JERSEY.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 427,038, dated May 6, 1890.

Application filed September 7, 1889- Serial No. 323,270. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM E. BROOK, a citizen of the United States, and a resident of Plain field, in the county of Somerset and State of New Jersey, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specification.

My invention is a mechanical movement for imparting rotary motion to a crank; and it consists of the novel devices hereinafter described for automatically adjusting a movable fulcrum for one of two levers in relation to the crank-axis, so that a comparatively short throw of the main lever is required for operating the crank.

In the accompanying drawings, Figure I represents a sectional elevation of a mechanical movement embodying my invention. Fig. II represents a plan view thereof.

Similar letters of reference indicate similar arts.

The letters A 13 indicate two sets of levers,

each having a bar A or B at one end, con-' necting the levers of the respective sets to each other, for adapting said levers to be operated,one set by the hands and the other by the feet. 0 indicates a double crank, to which both of said levers are connected by means of rods or pitmen A B the latter extending from the crank-pin to an intermediate portion of the levers.

D indicates a swinging arm, which carries a pivot D ,forming a fulcrumfor the main or In the frame G are also mounted the stud D and a shaft 0, carrying the double crank C, while above said frame is arranged a seat J, in a suitable position to enable the occupant toreach the bars A B with the hands and feet, respectively, for operating the le vers.

In the operation of said levers A B the swinging arm D is put in motion through the rod I, causing the pivot D to move in a direction toward and from the axis of the crank O, and due to this adjustment of said pivot the handlever A is brought to varying distances from said crank during its oscillating motiomwith the effect of reducing the degree of such motion required to operate the crank. In other .words, by said automatic adjustment of the pivot D a crank of large radius may be operated by a comparatively short throw of the lever A, and a great amount of power is obtained with the least expenditure of manual force.

What I claim as new, and desire to secure by Letters Patent, is-

1. A mechanical movement consisting of a double crank, two levers connected to said crank by suitable rods, a movable and a fixed fulcrum for said levers, respectively, and a means for connecting the movable fulcrum to the lever having the fixed fulcrum, whereby the movablefulcrum is automatically adj usted relatively to the crank-axis, as and for the purpose described.

2. A mechanical movement consisting of a double crank, a hand-lever and foot-lever, both connected to said crank by suitable rods, a swinging arm carrying the fulcrum for the hand-lever, a fixed fulcrum for the foot-lever, and a rod connecting said arm with the footlever, substantially as and for the purpose described.

WILLIAM E. BROOK.

Witnesses:

FRANCIS O. BOWEN, CHAs. WAHLERS. 

